Is it safe to check my Google rankings manually?

I wonder if it is OK if I check my Google rankings manually by searching for my keywords on e.g. twice a week? I'm ranking for many keywords, so I just search for them on Google on my Chrome browser (I'm logged into my Google account). I do not click on any search result, I just check my positions.

Is this safe? I'm doing white-hat SEO only and building links naturally. I currently cannot afford a rank tracking software.
Checking ranking cause NO harm to your website. But why not use 3rd party service like: serplab, serpfox or proranktracker? it will definitely save you a lot of time.
It is completely safe to check keywords manually. In fact it is good practice, ou can get accurate and latest results by checking keywords manually
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